<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>
    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
    <!-- 章节 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}
                <span class="acts">
                    <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>
            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}
                    <span class="acts">
                        <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                        <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                    </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" :title="titleName+'章节'">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdateChapter">确 定</el-button>
        </div>
    </el-dialog>
    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" :title="titleName+'课时'">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.isFree">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <!-- TODO -->
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/vodservice/upload'"
            :limit="1"
            class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
                <div slot="content">最大支持1G<br>
                    支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                    GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                    MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                    SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>
<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
    data() {
        return {
            saveBtnDisabled:false,
            saveVideoBtnDisabled: false,
            chapterList: [],
            courseId: '',
            dialogChapterFormVisible: false,
            dialogVideoFormVisible: false,
            chapter: {},
            video: {},
            titleName: '',
            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },
    created() {
      this.init()
    },
    methods:{
      init() {
        if (this.$route.params && this.$route.params.id) {
          this.courseId = this.$route.params.id
          this.getChapterListByCourseId()
        }
      },
      getChapterListByCourseId() {
        chapter.getChapterListByCourseId(this.courseId).then(response => {
          this.chapterList = response.data.chapterList
        })
      },
      previous() {
        this.$router.push({path:'/course/info/' + this.courseId})
      },
      next() {
        //跳转到第二步
        this.$router.push({path:'/course/publish/' + this.courseId})
      },
      //弹出添加章节页面
      openChapterDialog() {
        this.titleName = '添加'
        //弹框
        this.dialogChapterFormVisible = true
        //表单数据清空
        this.chapter = {}
      },
      saveOrUpdateChapter() {
        if (!this.chapter.id) {
          this.addChapter()
        } else {
          this.updateChapter()
        }
      },
      addChapter() {
        this.chapter.courseId = this.courseId
        chapter.addChapter(this.chapter).then(response => {
          this.dialogChapterFormVisible = false
          this.$message({
            type: 'success',
            message: '添加章节成功！'
          })
          this.getChapterListByCourseId()
        })
      },
      updateChapter() {
        this.chapter.courseId = this.courseId
        chapter.updateChapter(this.chapter).then(response => {
          this.dialogChapterFormVisible = false
          this.$message({
            type: 'success',
            message: '修改章节成功！'
          })
          this.getChapterListByCourseId()
        })
      },
      openEditChatper(chapterId) {
        this.titleName = '编辑'
        this.dialogChapterFormVisible = true
        chapter.getChapterById(chapterId).then(response => {
          this.chapter = response.data.chapter
        })
      },
      removeChapter(chapterId) {
        this.$confirm('此操作会删除章节，是否继续？', '提示', {
                confirmButtonText: '确认',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                chapter.deleteChapter(chapterId).then(response => {
                    this.$message({
                        type: 'success',
                        message: '删除章节成功！'
                    })
                    this.getChapterListByCourseId()
                })
            })
      },
      // 弹出添加小节页面
      openVideo(chapterId) {
        this.titleName = '添加'
        this.dialogVideoFormVisible = true
        this.video = {}
        this.video.chapterId = chapterId
        this.fileList = []
      },
      saveOrUpdateVideo() {
        if (!this.video.id) {
          this.addVideo()
        } else {
          this.updateVideo()
        }
      },
      addVideo() {
        this.video.courseId = this.courseId
        video.addVideo(this.video).then(response => {
          this.dialogVideoFormVisible = false
          this.$message({
            type: 'success',
            message: '添加小节成功！'
          })
          this.getChapterListByCourseId()
        })
      },
      updateVideo() {
        this.video.courseId = this.courseId
        this.video.chapterId = this.chapter.id
        video.updateVideo(this.video).then(response => {
          this.dialogVideoFormVisible = false
          this.$message({
            type: 'success',
            message: '修改小节成功！'
          })
          this.getChapterListByCourseId()
        })
      },
      openEditVideo(videoId) {
        this.titleName = '编辑'
        this.dialogVideoFormVisible = true
        
        video.getVideoById(videoId).then(response => {
          this.video = response.data.video
        })
      },
      removeVideo(videoId) {
        this.$confirm('此操作会删除小节，是否继续？', '提示', {
                confirmButtonText: '确认',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                video.deleteVideo(videoId).then(response => {
                    this.$message({
                        type: 'success',
                        message: '删除小节成功！'
                    })
                    this.getChapterListByCourseId()
                })
            })
      },
      handleVodUploadSuccess(response, file, fileList) {
        this.video.videoSourceId = response.data.videoId
        this.video.videoOriginalName = file.name
      },
      handleUploadExceed() {
        this.$message.warning('如果需要重新上传视频，请先删除已上传视频！')
      },
      handleVodRemove() {
        video.deleteVodVideo(this.video.videoSourceId).then(response => {
          this.$message({
            type: 'success',
            message: '删除视频成功！'
          })
          this.fileList = []
          this.video.videoSourceId = ''
          this.video.videoOriginalName = ''
        })
      },
      beforeVodRemove(file, fileList) {
        return this.$confirm(`确定移除${file.name}`)
      }
    }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}
.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>